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Q: When do you have to use the common denominators?

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If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.

Common multiples and common denominators can be found using the same process. They differ in their function. Common denominators are common multiples that are functioning as denominators.

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator.

Denominators which have no common factors

Common denominators are common multiples of two or more denominators.

The least common denominator is the least common multiple of the denominators.

multiply the denominators

The least common multiple of the denominators is knows as the LCD or least common denominator.

Multiply them by each other.

Denominators. This is where the term, common denominators comes from.

There are an unlimited number of common denominators if you want to use ridiculously large numbers. There is ONLY ONE Least Common Denominator (LCD, LCM).

probably to multiply easier

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